Fatal error: Uncaught mysqli_sql_exception: Unknown column 'a_id' in 'where clause' in /homepages/37/d70455246/htdocs/sh/mysqlMigration.php:52 Stack trace: #0 /homepages/37/d70455246/htdocs/sh/mysqlMigration.php(52): mysqli->query('SELECT * FROM k...') #1 /homepages/37/d70455246/htdocs/sh/Klimaschutzrallye2.php(75): mysql_query('SELECT * FROM k...') #2 {main} thrown in /homepages/37/d70455246/htdocs/sh/mysqlMigration.php on line 52